Many studies have shown the effectiveness of photorefractive keratectomy (PRK) in correction of vision in low and moderate Myopia. To evaluate the results of 193-nm exeimer laser photorefractive keratectomy for highly Myopic eyes, we reviewed refractive outcome of 43 eyes of 30 patients. Most eyes were treated with 1-step operation, using a 6 mm optical zone. 43 eyes were treated for Myopia, which were between -6.40 and -16.90 diopters. The mean pre-operative refraction was -9.50 D. All eyes were followed for at least 12 months. At 12tht month visit, 30.2% and 60.5% of eyes achieved correction within 1 and 2 D of attempted correction, respectively. At this time, 62.7% of eyes obtained 20/40 visual acuity or better uncorrected. At 1 year, 13% and 8% of eyes lost 3 and 4 lines of best-corrected visual acuity, respectively. Also 13% of eyes lost 2 lines. 12 months after PRK, 5 eyes developed corneal haze grade 2 and 2 eyes, grade 3 (0-5 scale). There was much undercorrection seen in this group compared with patients undergoing PRK for low and moderate Myopia. Photorefractive keratectomy for high Myopia, though effective, is not a safe and accurate procedure and is less predictable and stable than performing it for low and moderate Myopia.
|Number of pages||5|
|Journal||Tehran University Medical Journal|
|Publication status||Published - Jul 2000|